Sand-screen.



Patented Apr. 3 0

S. W. DOW.

SAND SCREEN.

(Application file d Nov. 29, @901.)

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No. 697,076. Patented Apr. 8, I902.

S. W. DOW.

SAND SCREEN.

(Application filed Nov. 29, 1901.) (No Model.) W 3-Sheets-Sheet 2.

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a n W No. 697,076. Patented Apr. 8, I902.

S. W. DOW.

SAND SCREEN. (Application fil ed Nov. 29, 1901.)

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(No Model.)

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SAMUEL W'. DOW, .OF MALLARD, IOWA.

SAND-SCREEN.

SPECIFICATION forming part of Letters Patent No. 697,076, dated April 8,1902.

' Application filed November 29, 1901. Serial No. 84,086. (No model.)

To all whom it ntcty concern:

Be it known that I, SAMUEL XV. DOW, a citizen of the United States,residing at Mallard, in the county of Palo Alto and State of Iowa, haveinvented certain new and useful Improvements in Sand Screens; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

This invention relates to screens designed chiefly for sifting sand, andaims to provide a device of this character which can be readilytransported and easily operated without pro-' ducing the fatigueincident to the ordinary screen, against which the sand is thrown in thescreening operation. The machine is constructed to admit of coarse andfine screens being interchangeablyused, the screen having a jigging orvibratory motion imparted thereto and the mechanism being operatedeither by hand or any convenient motive power.

For a full description of the invention and the merits thereof, and alsoto acquire a knowledge of the details of construction of the means foreffecting the result, reference is to be had to the followingdescription and drawings hereto attached.

While the essential and characteristic features of the invention aresusceptible of modification, still the preferred embodiment of theinvention is illustrated in the accompanying drawings, in which-- Figure1 is a perspective view of a machine constructed in accordance with andembodying the essential features of the invention. Fig. 2 is a side viewthereof. Fig. 3 is a perspective view of the lower or delivery end. Fig.4. is an end view of the machine. Fig. 5 is a vertical longitudinalsection of the upper or receiving end portion, showing the relation ofthe working parts. Fig. 6 is a section on the line X X of Fig. 2 lookingto the rear. Fig. 7 is a view of the machine inverted, the ground-wheelsbeing omitted. Fig. 8 is a perspective view of the screen-holder, thevibratory supports therefor, and the screen, the latter being inposition.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

The frame comprises longitudinal bars 1, transverse bars-2, firmlyconnecting the bars 1, and legs or supports 3 and 4. When the machine isin position for use, the frame inclines to the horizontal and its lowerend is supported by thelegs 4:, resting on the ground, and its upper endis supported by groundwheels 5, fitted to the ends of the axle 6, fittedto the lower end of the supports 3. A hopper 7 is provided at the upperor receiving end of the machine, and the sand or other material to bescreened is dumped therein and passes to the screen 8, locatedtherebelow.

Ascreen-holder 9 is located below the frame and is supported in such amanneras to receive a lateral vibratory or shaking movement, and thisholder may be of any construction to receive screens 8 ofdifferent-sized mesh, according as the material is to be screened coarseor fine. As shown, the longitudinal or side bars of the holder aregrooved and the screen 8 is slid into the grooves, thereby admitting ofeither a coarse or a fine screen being placed in position, the screenbeing held in the holder by any suitable fastening means. Gross-bars 10and 11 are secured to the screen-holder and the vibratory or swingingsupports are pivotally connected at one end thereto. The lower supports12 are pivoted at their upper ends to the legs 4:, and their lower endshave pivotal connection with the projecting ends of the cross-bar 11.The upper supports 13 are pivoted at their lower ends to the legs 3 andat their upper ends to the ends of the cross-bar 10. The parts 12 may beproperly termed hangers, whereas the parts 13 are standards, and thesesupports bear against the side of the respective legs facing thereceiving or upper end of the machine, with the result that the holder 9and screen 8 cannot slip downward and are firmly supported against theweight of the material imposed thereon.

A shaft 14: is arranged transversely of the machine and is journaled inbearings applied to extensions 15, forming a part of the ma chine-frame,and this shaft is adapted to receive the power by means of which thescreen is operated. Fly-wheels 16 are applied to the IOG ends of theshaft 14, and for manual operation a crank 17 is applied to an end ofthe shaft. Abevel-gear 18is secured to the shaft 14 for rotationtherewith and is in meshing relation with a companion bevel-gear 19,mounted upon a stub-shaft 20, arranged about at a right angle to theshaft 14. Abell-crank lever 21 has one arm connected by a pitman 22 witha wrist-pin applied to the bevel-gear 19, so as to receive anoscillatory movement therefrom when the shaft 14 is rotated. A link 23connects the opposite arm of the bellcrank lever with the screen-holder,so as toimpart a lateral reciprocating movement thereto. A companionbell-crank lever 24 is mounted upon an arm projected from a transversebar 25, connecting the legs 4, and one arm thereof is connected by apitman 26 with the cross-bar 11 or other convenient portion of thescreen-holder, and the other arm of the bell-crank lever is connectedbya rod 27 with the arm of the bell-crank lever 21, to which the pitman22 is attached. When the shaft 14 is rotated, the bell-crank levers 21and 24 are caused to oscillate in unison, and by reason of theirconnection with the screen or support therefor a lateral reciprocatingor jigging motion is imparted to the screen, and as the screen istransversely oscillated it at the same time receives an up-and-downmovement resulting from the oscillation of the supports 12 and 13, andthis vibratory motion, in conjunction with the inclination of thescreen, causes the sand or material to pass thereover from the upper orreceiving end of the screen to the lower or discharge end thereof, thematerial screened passing through the meshes and the screenings passingover the lower end of the screen.

machine, the weight thereof is supported directly upon theground-wheels. Hence the machine can be readily moved by one person. Byhaving the legs 4 resting upon the ground the machine is not liable todisplacement when in operation. The supports 3 and 4 are of differentlengths depending upon the desired inclination of the screen and therelative distance of the axle 6 from the ground.

Having thus described the invention, what is claimed as new is- Incombination, a frame, legs at opposite ends of the frame, a screenmounted on the frame for transverse reciprocation, hangers supportingthe delivery end of the screen and adapted to bear against the upperside of the lower legs, standards pivot-ally supporting the upper end ofthe screen, a transverse powerdriven shaft mounted upon extensions ofthe frame, upper and lower bell-crank levers connected for simultaneousoscillation, links connecting corresponding arms of the bell-cranklevers with the screen, and gearing between the upper bell-crank leverand the powerdriven shaft, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

SAMUEL WV. DOW.

Witnesses:

WILLIAM S. OOBURN, HERBERT O. HAMMITT.

